Year	Percent
1950	18.8845
1955	19.85832
1960	19.97334
1965	19.32371
1970	18.77736
1975	19.50498
1980	20.42363
1985	20.82742
1990	19.41293
1995	12.62906
2000	15.99732
2005	15.84887
2010	15.69159
2015	14.585
2020	13.2729
2025	12.09217
2030	11.3386
2035	10.80726
2040	10.22191
2045	9.47794
2050	8.68845
2055	8.00289
2060	7.46991
2065	7.0306
2070	6.64369
2075	6.25614
2080	5.90024
2085	5.6036
2090	5.38016
2095	5.21119
2100	5.07969